Journal
SCIENCE
Volume 375, Issue 6586, Pages 1266-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abl7759
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Funding
- NSFC [11988101, 11725313, 12003028, 12041303, 11873067, U2031117, 12041306, 11903049, 12103069]
- National Key R&D Program of China [2017YFA0402600]
- Key Research Project of Zhejiang Lab [2021PE0AC03]
- National SKA Program of China [2020SKA0120200]
- Lyman Spitzer, Jr. Fellowship at Princeton University
- Youth Innovation Promotion Association CAS [2021055]
- CAS Project for Young Scientists in Basic Research [YSBR-006]
- Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS
- Australian Research Council Discovery Early Career Award - Australian Government [DE210101738]
- Youth Innovation Promotion Association of CAS [2018075]
- China Postdoctoral Science Foundation [2020M681758]
- Australian Research Council [DE210101738] Funding Source: Australian Research Council
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Observations of five repeating FRBs revealed a trend of lower polarization at lower frequencies. This behavior can be modeled as multipath scattering, characterized by the rotation measure (RM) scatter. Sources with higher RM scatter have higher RM magnitude and scattering time scales. Furthermore, the two sources with the highest RM scatter are associated with compact persistent radio sources.
The polarization of fast radio bursts (FRBs), which are bright astronomical transient phenomena, contains information about their environments. Using wide-band observations with two telescopes, we report polarization measurements of five repeating FRBs and find a trend of lower polarization at lower frequencies. This behavior is modeled as multipath scattering, characterized by a single parameter, sigma(Rm), the rotation measure (RM) scatter. Sources with higher sigma(Rm) have higher RM magnitude and scattering time scales. The two sources with the highest sigma(Rm), FRB 20121102A and FRB 20190520B, are associated with compact persistent radio sources. These properties indicate a complex environment near the repeating FRBs, such as a supernova remnant or a pulsar wind nebula, consistent with their having arisen from young stellar populations.
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